• Mesa
  • ZiYang

A mesa is an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain. Mesas characteristically consist of flat-lying soft sedimentary rocks capped by a more resistant layer or layers of harder rock, e.g. shales overlain by sandstones. The resistant layer acts as a caprock that forms the flat summit of a mesa. The caprock can consist of either sedimentary rocks such as sandstone and limestone; dissected lava flows; or a deeply eroded duricrust. Unlike plateau, whose usage does not imply horizontal layers of bedrock, e.g. Tibetan Plateau, the term mesa applies exclusively to the landforms built of flat-lying strata. Instead, flat-topped plateaus are specifically known as tablelands.

Ziyang, a prefecture-level city in Sichuan Province, Ziyang County under the jurisdiction of ancient Zizhou (current capital), ancient writers Kui Hong, Dong Jun and Wang Bao are also known as the "three sages of Ziyang". Lezhi is the hometown of Marshal Chen Yi, the founding father of the country. It is located in the middle of Sichuan Basin, adjacent to the Neijiang River in the south, Chengdu and Deyang in the north, Chongqing and Suining in the east and Meishan in the west. It is the only regional central city in Sichuan Province that connects the "double core" of Chengdu and Chongqing at the same time. Ziyang County in the Western Han Dynasty in 135 BC, followed by states and counties, has a history of more than 2100 years. 35000 years ago, the ancient "Ziyang people" opened the history of human civilization in Sichuan. On February 26, 1998, Ziyang District was established with the approval of the State Council, and on June 14, 2000, Ziyang District was abolished with the approval of the State Council.
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